CONTENTS. 

 VOL. X. 



Page 

 Propositions upon Arithmetical Progressions. By F. Elefanti, Esq. 1 



On the Electric Properties of Insulating or Non-conducting Bodies. 

 By Professor Carlo Matteucci of Pisa 2 



On the Synthesis of Acetic Acid. By J. A. Wanklyn, Esq 4 



On the Resistance of Glass Globes and Cylinders to collapse from ex- 

 ternal pressure, and on the Tensile and Compressive Strength of 

 various kinds of Glass. By William Fairbairn, Esq., C.E., F.R.S., 

 and T. Tate, Esq., F.R.A.S 6 



On the Atomic Weight of Graphite. By B. C. Brodie, Esq., F.R.S., 

 Pres. C.S., Professor of Chemistry in the University of Oxford . . 11 



On the Alloys. Part I. The Specific Gravity of Alloys. By A. 

 Matthiessen, Ph.D 12 



On the Anatomy of Victoria Regia.Psxt II. By Arthur Henfrey, 

 Esq., F.R.S., F.L.S. &c., Professor of Botany in King's College, 

 London 14 



On the Conductivity of Mercury and Amalgams. By F. Craee-Cal- 

 vert, Esq., F.R.S., and R. Johnson, Esq 14 



On the Intimate Structure, and the Distribution of the Blood- vessels, 

 of the Human Lung. By A. T. H. Waters, Esq., Lecturer on 

 Anatomy and Physiology, Liverpool 16 



On certain Sensory Organs in Insects, hitherto undescribed. By J. 

 Braxton Hicks, M.D. Lond., F.L.S. &c 25 



On Lesions of the Nervous System producing Diabetes. By Frederick 

 W. Pavy, M.D. Lond. &c 27 



On the Electrical condition of the Egg of the Common Fowl. By 

 John Davy, M.D., F.R.SS. L. & E. &c 31 



On the Mode in which Sonorous Undulations are conducted from the 

 Membrana Tympani to the Labyrinth, in the Human Ear. By 

 Joseph Toynbee, Esq., F.R.S. &c 32 



On the Electrical Discharge in vacua with an Extended Series of the 

 Voltaic Battery. By John P. Gassiot, Esq., F.R.S 36 



Note on the Transmission of Radiant Heat through Gaseous Bodies. 



By John Tyndall, Ph.D., F.R.S. &c 37 



02 



